Weft detector in loom transferrer arm



Patented May 7, 19 29.

UNITED STATESFPATENT ;()FF11CE,

OSCAR V. PAYNE, OF WORCESTER, MASSACHUSETTS, ASSIGINOR TO CROMPTON & KNOWLES LOO M'. WORKS, F WORCESTER, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

WEFT DETECTOR IN LOOM TRANSFERRER ARM.

Application filed November 15, 1926. Serial No. 148,403.

This invention relates to improvements in detectors mounted on regularly moving loom transferrer arms and it is the principal ob ject, of my invention to provide a detector which is yieldable relatively to its mounting so as to avoid objectionable abrasion when detecting fine yarn and to render the detector more sensitive in its operation.

In looms of the type set forth in Patent N 0. 1,372,316 there is provided a transferrer arm which receives a downward movement every alternate or detecting beat of the loomi and there is mounted on the transferrer arm a weft detector which engages the top of the bobbin in the shuttlewhen the latter is on the detecting or magazine side of the loom. As usually made these detectors are pivoted directly to an arm mounted on the transferrer and the whole force tending to move the detector toward the surface to be detected is brought to bear on the bobbin (see U. S. Patents Nos. 1,369,473, 1,551,219, and 1,604,258), It is an important object of my invention to introduce a yieldable element between the detector and its carrier which shall act to absorb any shock to which the yarn might otherwise be subjected due to the weight of the carrier.

It is a further object of my invention to n-ovide a detector of the type specified wherein the detector is slida'bly mounted on its carrier and is movable relatively thereto along the line followed by the carrier and detector as they move toward the bobbin at the time of detection.

Vith these and other objects in view which will appear as the description proceeds, my invention resides in the combination and arrangement of parts hereinafter described and set forth in the claims.

In the accompanying drawings wherein I have shown a convenient embodiment of my invention, 7

Fig. 1 is a vertical section through that portion of the transferrer arm which lies over the bobbin when the shuttle is in de tecting position, the parts being shown as in contact with a sufficient supply of weft,

Fig. 2 is a view similar to Fig. 1 showing weft exhaustion,

the parts moved ,to a position to indicate- Fig. 3 is a side elevation taken in the direction of arrow 3, Fig. 1, and

Fig. 4 is a detail vertical section online 4% of Fig. 1.

Referring to the drawings, I have indicated the transferrer lever at 10 and have provided the same with a transferring heel 11 positioned for engagement with the butt of a bobbin B at the time of transfer. A plunger 12 having a head 13 is slidable in a recess 14 extending through a portion of the transferrer arm. A compression spring 15 is interposed between the head 13 and a small clip 16 through which the reduced part of the plunger 12 extends, said clip being secured in place by other suitable means. A web 18 extends across the parallel vertical walls 19 whichdefine a vertical slot 20 and guides the right hand end 21 of the plunger, said end being provided with a circular groove 22 which receives a holding projection 23 on a latch or hook 2 1. Said latch is pivotally mounted on a pin 25 extending across the vertical slot 20 and is held yieldingly in the position shown in Fig. l by a torsion spring 26 one end of which extends over one of the walls 19 as at 27 and the other end of which extends over the top of the latch as at 28. The lower endv 29 of the latch may be inclined detector at the time of indication of we ft exhaustion to move upwardly against, the action of spring 26 so that the spring 14 will move the plunger from the position shown in Fig. 1 to that shown in Fig. 2.

As set forth in the aforesaid patents the transferrer arm has a rapidly descending and ascending movement each detecting beat of the loom when the lay is in its extreme forward position, the plunger being released when the transferrer arm is in its extreme downward position so that as said arm 10 is raised the projecting head 13 of the plunger will engage and rock an indicating lever 30 the lower portion of which isshown in Fig. 2. The matter thus far described forms no particular part of my invention and may be made in any approved .manner.

In carrying my invention into effect I provide the transferrer arm with a pair of a screw 17 or any.

and is positioned to be engaged by a weft upwardly extending horns and secure in them a pin 41 on which is freely rotatable a ferrule 42. A detector carrier 13 is secured to the ferrule in any way, as by brazing, and has an upper horizontal portion 44: and a depending vertical arm .45. The lower end of arm 45. is bent at right angles and then doubled back on itself as at 46, the free end extending to the left and being slightly inclined as at 47. A light tension spring 48 interposed between the carrier 48 and a fixed point 49 of the transferrer arm tends normally to hold the portion 46 of the carrier against a web 50 which extends between the walls 19.

The detector is formed as a U-shaped member having a short leg 51 extending upwardly through the free end of the carrier and a long leg 52 passing frcelv through the double part 46 and also extending through the horizontal portion 44. A compression spring 53 is interposed between the top of the carrier and a collar 5% adjustably secured to the leg 52 by set screw The lower portion of the detector may be provided with a small yarn engaging block 56 roughened or toothed on its lower surface to resist movement when in contact with yarn and offset horizontally from the pin ll.

In operation the transferrer will be lowered when the shuttle is thereunder and the detector D will have the roughened lower surface thereof brought into contact with the bobbin. If sufficient weft for continued weaving is present the spring 53 will be compressed, as shown in Fig. 1, and angular movement of the carrier and the detector about stud 41 will be resisted by reason of the friction between the detector and the yarn. When insufficient weft is left on the bobbin, however the friction between the detector block 56 and the bare bobbin will not be sufficient to hold the parts in. the position shown in Fig. 1 and they will move to the position shown in Fig. 2 about pivot ll, expanding the light spring 48. As the detector and its carrier move to this posi ion the free end d7 of the carrier will engage the depending arm 29 of the latch 2 1 and give the sa-i e aright hand movement around pin 24 to release the plunger 12. The latter will move as previously described and give an indication of weft exhaustion as set forth in the aforesaid patents, and the plunger will be reset on the upward stroke of the transferrer arm after spring 18 has returned the carrier to its normal position.

I find that the introduction of compression spring 53 between the detector and its carrier acts as a shock absorber and eases the surface to V be detected.

the action of the detector on the yarn, sparing the yarn of undeslrable abrasion and rendering the detector more sensitive in its operation.

From the foregoing it will be seen that I have provided a weft detector of the type specified wherein a resilient device is interposed between the yarn engaging detector and the carrier therefor to render the detector yieldable along a line extending from It will further be seen that the detector is slidably mounted on its carrier and is yieldable with respect to the latter in the line along which the de tector moves toward the surface being detected. Furthermore, the detector and its carrier are located between the pivot of the latter and the latch thus providing a compact construction.

Having thus described my invention. it will be apparent that changes and modiii cations may be made therein by those skilled in the art without departing from thespirit and scope of the invention, and I do not wish to be limited to the details herein disclosed, but what I claim is:

1. In a detector for a loom having a transferrer arm movable toward the surface to be detected on each detecting beat of the loom, a detector carrier pivotally connected to the transferrer arm, a U-shaped detector member slidably mounted on the carrier along a line extending from the surface to be detected, and a compression spring surrounding a leg of the detector member and interposed between the latter and a portion of the carrier, said compression spring im-' parting a yielding force from the carrier to the detector as the latter is presented to the surface to be detected on the downward movement of the transferrer arm.

2. In a detector for a loom having a transferrer arm movable toward the surface to be detected on each detecting beat of the loom, a weft detector carrier pivoted to the transferrer arm and having a portion normally in contact with another portion of the transfcrrer arm to position said carrier, indicating mechanism including a latch having a portion to be engaged directly by the carrier, a weft detector slidably mounted in the carrier along a line extending from the surface to be detected, and resilient means to resist such movement and tending to hold the detector downwardly and causing said carrier to move against the latch when the detector indicates substantial exhaustion.

In testimony whereof I have hereunto affixed my signature.

oscan v. PAYNE.

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